A researcher surveyed college students to study their opinion about the proposed change in smoking rules. The researcher asked a group of 30 students: 12 of them supported the change, 13 of them did not, and 5 had no opinion. This is not a binomial model because...

A. ...there are 3 possible outcomes, not 2.

B. ...the students who strongly supported the change and those who only mildly supported the change are counted the same.

Some of the requirements of a binomial model are:
1. probability of success is known and does not vary over the experiment
2. Has exactly two outcomes (head/tail, success/failure).
3. has one or multiple steps
4. is a random experiment

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